<template>
  <div>
    <!-- 导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加商品</el-button
          >
        </el-col>
      </el-row>
      <!-- 商品表格 -->
      <tree-table
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
        :expand-type="false"
        class="treeTable"
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            type="success"
            size="mini"
            v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button
            type="primary"
            icon="el-icon-edit"
            size="mini"
            @click="changeEditCate(scope.row.cat_id)"
            >编辑</el-button
          >
          <el-button
            type="danger"
            icon="el-icon-delete"
            size="mini"
            @click="removeCate(scope.row.cat_id)"
            >删除</el-button
          >
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加商品对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：" prop="cat_name">
          <el-cascader
            expand-trigger="hover"
            v-model="selectedkeys"
            :options="parentCateList"
            :props="{
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name',
              children: 'children',
            }"
            @change="parentCateChanged"
            clearable
            change-on-select
            style="width: 100%"
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改分类名称对话框 -->
    <el-dialog
      title="修改分类名称"
      :visible.sync="editCateDialogVisible"
      width="50%"
      @close="editCateDialogClosed"
    >
      <el-form
        :model="editCateForm"
        :rules="editCateFormRules"
        ref="editCateFormRef"
        label-width="100px"
      >
        <el-form-item label="商品分类" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCateInfo">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  created () {
    this.getCateList()
  },
  data () {
    return {
      // 商品数据列表
      cateList: [],
      // 查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      total: 0,
      // 为表格指定列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          // 指定当前列为模板列
          type: 'template',
          // 当前这一列使用的模板名称
          template: 'isok'
        },
        {
          label: '排序',
          // 指定当前列为模板列
          type: 'template',
          // 当前这一列使用的模板名称
          template: 'order'
        },
        {
          label: '操作',
          // 指定当前列为模板列
          type: 'template',
          // 当前这一列使用的模板名称
          template: 'opt'
        }
      ],
      addCateDialogVisible: false,
      // 添加表单数据对象
      addCateForm: {
        cat_pid: 0,
        cat_name: '',
        cat_level: 0
      },
      // 验证规则
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      // 父级分类列表信息
      parentCateList: [],
      // 级联选择器的配置对象
      // cascaderProps: {
      //   value: 'cat_id',
      //   label: 'cat_name',
      //   children: 'children'
      // },
      // 选中的父级ID
      selectedkeys: [],
      // 修改
      editCateDialogVisible: false,
      // 查询到的商品分类信息
      editCateForm: {},
      // 修改校验规则
      editCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 获取商品信息
    async getCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: this.querInfo
      })
      if (res.meta.status !== 200) {
        return this.$message('请求商品数据失败！')
      }
      this.cateList = res.data.result
      this.total = res.data.total
    },
    // 监听pagesize的改变
    handleSizeChange (newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum的改变
    handleCurrentChange (newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击添加分类时
    showAddCateDialog () {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级商品数据
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类失败！')
      }
      this.parentCateList = res.data
    },
    // 选择项发生变化的时候触发
    parentCateChanged () {
      // 如果length大于0，证明选中了父级分类
      if (this.selectedkeys.length > 0) {
        // 获取父类ID
        this.addCateForm.cat_pid = this.selectedkeys[
          this.selectedkeys.length - 1
        ]
        // 当前分类等级
        this.addCateForm.cat_level = this.selectedkeys.length
      } else {
        // 获取父类ID
        this.addCateForm.cat_pid = 0
        // 当前分类等级
        this.addCateForm.cat_level = 0
      }
    },
    addCate () {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return false
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败！')
        }
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 监听添加分类对话框
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedkeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    // 修改-查询
    async changeEditCate (id) {
      const { data: res } = await this.$http.get(`categories/${id}`)
      if (res.meta.status !== 200) {
        this.$message.error('查询商品分类失败！')
      }
      this.editCateForm = res.data
      this.editCateDialogVisible = true
    },
    // 监听修改对话框的显示
    editCateDialogClosed () {
      this.$refs.editCateFormRef.resetFields()
    },
    // 修改提交
    editCateInfo () {
      this.$refs.editCateFormRef.validate(async (valid) => {
        if (!valid) return false
        const { data: res } = await this.$http.put(
          `categories/${this.editCateForm.cat_id}`,
          {
            cat_name: this.editCateForm.cat_name
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改商品分类失败！')
        }
        this.$message.success('修改商品分类成功！')
        this.getCateList()
        this.editCateDialogVisible = false
      })
    },
    // 删除
    async removeCate (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }
      const { data: res } = await this.$http.delete(`categories/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除商品分类失败！')
      }
      this.$message.success('删除商品分类成功！')
      this.getCateList()
    }
  }
}
</script>

<style lang="scss" scoped>
.treeTable {
  margin-top: 20px;
}
</style>
